Lol. I am in South India, and when gaming, i frequently get better ping to Singapore than other parts of India; Also performance varies widely depending on my ip and the time of the day. The routing in local isps is atrocious. I thought the situation would be different for commercial connections but your experience seems to suggest otherwise.

Run traceroute and see where it's going.

Doesn't look good at Mumbai:

  6    39 ms    39 ms    39 ms  ix-xe-9-0-1-0.tcore2.MLV-Mumbai.as6453.net [180.87.39.57]
  7    40 ms    39 ms    39 ms  if-ae-2-2.tcore1.MLV-Mumbai.as6453.net [180.87.38.1]
  8   131 ms   123 ms   124 ms  180.87.38.6
  9   141 ms   135 ms   134 ms  115.114.89.118.static-Mumbai.vsnl.net.in [115.114.89.118]
 10   143 ms   136 ms   183 ms  52.95.66.176
 11   139 ms   136 ms   136 ms  52.95.66.197
 12   124 ms   124 ms   123 ms  52.95.67.208
 13     *        *        *     Request timed out.
 14     *        *        *     Request timed out.
 15     *        *        *     Request timed out.
 16   136 ms   136 ms   136 ms  <Instance IP>

Whereas for Singapore:

  6   145 ms   154 ms   146 ms  38895.sgw.equinix.com [27.111.228.215]
  7    94 ms   102 ms    92 ms  52.93.8.10
  8    94 ms    92 ms    92 ms  52.93.8.29
  9   106 ms   104 ms   104 ms  203.83.223.31
 10   107 ms   104 ms   104 ms  <Instance IP>

What is your src IP? Both 52.95.67.208 and 203.83.223.31 are less than 80ms for me from Mumbai.